Issue #21330 has been updated by ko1 (Koichi Sasada). I'm afraid that moving frozen flag into class_ext (and each built-in class variants can has each frozen state) makese `OBJ_FROZEN` code: ```C // include/ruby/internal/fl_type.h static inline VALUE RB_OBJ_FROZEN_RAW(VALUE obj) { return RB_FL_TEST_RAW(obj, RUBY_FL_FREEZE); } ``` especially, if nobody freeze builtin classes. Any usecases? ---------------------------------------- Bug #21330: Namespace: Class and Module frozen status is not namespaced https://bugs.ruby-lang.org/issues/21330#change-113550 * Author: byroot (Jean Boussier) * Status: Open * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ```ruby File.write("/tmp/test.rb", <<~'RUBY') Hash.freeze RUBY ns = Namespace.new ns.require("/tmp/test.rb") class Hash def monkey_patch end end ``` Expected behavior: Since the monkey patch is in a different namespace, I'd expect it to not impact code that is running in another namespace. Actual behavior: ``` test.rb:9:in '<class:Hash>': can't modify frozen class: Hash (FrozenError) ``` The class is frozen globally, breaking code in other namespaces. Is this by design, or does that mean the frozen status need to be moved in the `classext_t` as well? cc @tagomoris -- https://bugs.ruby-lang.org/

Issue #21330 has been updated by byroot (Jean Boussier).

I'm afraid that moving frozen flag into class_ext (and each built-in class variants can has each frozen state) makese OBJ_FROZEN code:

It seems like your sentence is missing a word. Did you mean to say that it will make `OBJ_FROZEN` slower? If so yes, absolutely, but I thought it was a given. Namespaces are introducing a level of indirection it need to be checked and isn't cheap. But on this note I'm currently working on two patches that may help with that: - Moving the frozen bit inside the shape_id: https://github.com/ruby/ruby/pull/13289 - Delegating classes variables handling: https://github.com/ruby/ruby/pull/13411 With those two changes, once finished, I believe I can come up with a `RB_OBJ_FROZEN_RAW` that has almost the exact same performance.

Any usecases?

What Jeremy said, but also just consistency? It's very hard to reason about a feature that isn't behaving consistently. ---------------------------------------- Bug #21330: Namespace: Class and Module frozen status is not namespaced https://bugs.ruby-lang.org/issues/21330#change-113553 * Author: byroot (Jean Boussier) * Status: Open * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- ```ruby File.write("/tmp/test.rb", <<~'RUBY') Hash.freeze RUBY ns = Namespace.new ns.require("/tmp/test.rb") class Hash def monkey_patch end end ``` Expected behavior: Since the monkey patch is in a different namespace, I'd expect it to not impact code that is running in another namespace. Actual behavior: ``` test.rb:9:in '<class:Hash>': can't modify frozen class: Hash (FrozenError) ``` The class is frozen globally, breaking code in other namespaces. Is this by design, or does that mean the frozen status need to be moved in the `classext_t` as well? cc @tagomoris -- https://bugs.ruby-lang.org/